New London police found a loaded pistol in the glove compartment of a car that was seized from three men accused of attacking a construction worker at the Nathan Hale school on April 19, according to prosecutor Michael Kennedy.

The alleged main player of the incident, 22-year-old Vincent Sullivan of Middletown, was arraigned Wednesday in New London Superior Court, the day after his father, 47-year-old Brian P. Sullivan, turned himself in to New London police knowing they held a warrant for his arrest on conspiracy charges.

Vincent Sullivan, Kebner Dulphe III, 27, of Middletown and Nicholas Vinci, 18, of Cromwell are accused of donning ski masks and assaulting 44-year-old David Zbell at the school construction site at the corner of Beech Drive and Ocean Avenue. The attack occurred immediately after Brian Sullivan approached his co-workers at the site, Zbell and Erik Cyr, as they walked toward their car, according to police. They said Sullivan accused Zbell of telling people that he was smoking marijuana on the job.

The assailants fled in a Toyota Camry, which Waterford police stopped a short time later based on a witness description.

All three were charged with second-degree assault, second-degree reckless endangerment and breach of peace. Dulphe and Vinci were held overnight and arraigned the following day, but Sullivan posted the $25,000 bond and was released. At his arraignment Wednesday, the court increased his bond by $25,000. Sullivan posted the bond and is due back in court on May 8.

Kennedy said New London police obtained a search warrant for the Toyota Camry. They found a loaded .22-caliber pistol in the glove compartment along with gloves and a ski mask, he said. They found more ammunition, marijuana and duct tape in the trunk of the car, Kennedy said. According to a court document, the police determined that Vinci was driving the car, Sullivan was the right front passenger and Dulpe was sitting in the back seat on the left.

The father, Brian Sullivan, showed up for work the next day and was informed that he “was no longer going to be working at the site,” and was escorted off the property, according to police. He is free on a $50,000 bond and is due to appear in court on May 8 on charges of conspiracy to commit second-degree assault and disorderly conduct.

Kennedy said Zbell’s orbital bone was not broken in the attack as initially reported, but that his injuries were serious. He said the investigation is ongoing.